2.3.3. Physical indicators
The thermal comfort level of the indoor environment is measured using an indoor climate analyzer DirectSense IAQ (Model IQ610, Graywolf), which allowed measuring the room ambient temperature (dry bulb) and relative humidity, besides the concentration of several chemical pollutants referred in the next section. The concentration of airborne particulate matter (PM10: for particles of size ≤10 μm) was measured using an airborne particle counter (Model Handheld 3016 IAQ, LIGHTHOUSE).